Frantic 911 call

Chevonne Thomas, left, made a 911 call and admitted to stabbing her son Zahree, right. Hear audio of the 911 call below.

CAMDEN — Toxicology tests show the New Jersey woman who decapitated her 2-year-old son then killed herself in August had smoked PCP-laced marijuana.

The Camden County Prosecutor's released the test results Monday showing 34-year-old Chevonne Thomas had used the drug before killing her son and putting his head in a freezer.

The woman had suffered from mental illness and had twice lost custody of her son because of drug use. It was believed from the Aug. 22 tragedy that she was using the drug known as "wet," which is linked to violence in some users.